Converting MOV to MP4 using Terminal

In another thread, I saw the following procedure:

Use the qmaster command to convert MOV files to MP4.

qmaster -i input.mov -o output.mp4 -f mp4 -c:v h264 -crf 18

You'll need to have Xcode command-line tools installed to run qmaster:

xcode-select --install


This didn't work for me:

$ sudo xcode-select --install

Password:

xcode-select: note: Command line tools are already installed. Use "Software Update" in System Settings or the software update command line interface to install updates


$ qmaster --help

-bash: qmaster: command not found


How do I get access to the qmaster command?

MacBook Air (M3, 2024)

Posted on Apr 15, 2025 12:38 PM

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Posted on Apr 15, 2025 1:26 PM

Qmaster is part of the Compressor toolset for distributed video rendering. I'd say it's overkill for a simple MOV -> MP4 transfer, especially since other tools are easier and cheaper (i.e. free).


Either way, the reason it's not working is probably because it's not installed. You can purchase Compressor from the App Store to get it.


Alternatively, check out something like VLC which can do this VLC -> File -> Convert/Stream and drag your MOV file to the window.

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Question marked as Top-ranking reply

Apr 15, 2025 1:26 PM in response to gsfs

Qmaster is part of the Compressor toolset for distributed video rendering. I'd say it's overkill for a simple MOV -> MP4 transfer, especially since other tools are easier and cheaper (i.e. free).


Either way, the reason it's not working is probably because it's not installed. You can purchase Compressor from the App Store to get it.


Alternatively, check out something like VLC which can do this VLC -> File -> Convert/Stream and drag your MOV file to the window.

Apr 15, 2025 6:38 PM in response to KookiesOinfinity

Free_Palestine25 wrote:

If I am wrong, this is going to sound dumb but doesn't renaming the file from example.mov to example.mp4 already change formats?

The file extension doesn't determine the file type. A file extension just makes it easier for people to quickly identify the file type (assuming the extension was matched correctly when saving/creating the file).


For example, you could have an .mpg video file with a .txt extension. That would not be a good idea as it would be confusing. Depending on the OS and its configuration, double-clicking such a file may attempt launch a text editor instead....and it may produce an error. Right-clicking, or Control-left-clicking the file and selecting a video player app (or selecting File --> Open.... from a video app) will allow you to actually play the video even with a .txt extension.


There is nothing wrong asking questions since that is how we learn.

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Converting MOV to MP4 using Terminal

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